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Income Tax Expense - Schedule of Changes in Consolidated Deferred Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
(a) Within the Consolidated Statement of Comprehensive Income:      
Deferred tax - retirement benefit obligations $ (63) $ (36) $ 11
Tax on items recognised directly within other comprehensive income (77) (44) 11
(b) Within the Consolidated Statement of Changes in Equity:      
Deferred tax - share-based payment expense 7 10  
Current and deferred tax relating to items credited (charged) directly to equity 14 24 1
Income tax recognised outside the Consolidated Income Statement (63) (20) 12
Deferred tax - retirement benefit obligations      
(a) Within the Consolidated Statement of Comprehensive Income:      
Deferred tax - retirement benefit obligations (63) (36) 11
Deferred tax - cash flow hedges      
(a) Within the Consolidated Statement of Comprehensive Income:      
Deferred tax - cash flow hedges (14) (8) 0
(b) Within the Consolidated Statement of Changes in Equity:      
Deferred tax - share-based payment expense 17 0 0
Current tax - share option exercises      
(b) Within the Consolidated Statement of Changes in Equity:      
Current tax - share option exercises 7 14 2
Deferred tax - share-based payment expense      
(b) Within the Consolidated Statement of Changes in Equity:      
Deferred tax - share-based payment expense $ 10 $ (10) $ 1